Lately I am hearing a strange whistling noise coming from the engine bay. It sounds some sort of exhaust leak but I could be wrong. It sounds very similar to the this video posted by someone having the same issue:
It can be clearly heard at idle and at low revs. It seems to be a common issue but I can`t find the solution.

Has anyone ever had such issue and be kind enough to share the solution?

 

Try pushing the clutch in a little and see if it goes away, if it does, the clutch needs tightening. If it doesn't go away, try spraying some WD-40 or similar on the pulleys while its running and see if it goes away